Linear Accelerator
Negatively charged hydrogen ions are the starting point for creating proton and antiproton beams. The Linac, approximately 500 feet long, accelerates them to 400 million electron volts (MeV) or about 70 percent of the speed of light. Before entering the next accelerator the ions pass through a carbon foil, which removes electrons from the hydrogen ions, creating positively charged protons.

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last modified 1/8/2002